Method for harmonizing colors, corresponding computer program and device

1. A method for harmonizing colors of an original image, the method comprising:

computing, using a processor, at least a temporary harmonized image determined from the original image according to at least one color harmonic scheme;

computing, using said processor, a saliency map of said temporary harmonized image;

computing, using said processor, a saliency comparison result obtained from a comparison of a saliency map of the original image and the saliency map of said temporary harmonized image;

computing, using said processor, a corrected color comparison result from colors of the original image, colors of the color harmonic scheme and the saliency comparison result;

selecting, as the harmonized image, the temporary harmonized image obtained with the color harmonic scheme minimizing the corrected color comparison result; and

displaying the harmonized image on a display device.

2. The method according to claim 1 , wherein the saliency comparison result is a correlation coefficient between the saliency map of the original image and the saliency map of the temporary harmonized image.

3. The method according to claim 2 , wherein the correlation coefficient is a linear correlation coefficient between the saliency map of the original image and the saliency map of the temporary harmonized image.

4. The method according to claim 1 , wherein the corrected color comparison result is computed by dividing a color comparison result with the saliency comparison result, the color comparison result being the result of a comparison between the colors of the original image and the colors of the color harmonic scheme.

5. The method according to claim 4 , wherein the color comparison result is a result of a comparison between a hue distribution of the original image and a hue distribution of the color harmonic scheme.

6. The method according to claim 5 , wherein the hue distribution of the original image is a hue histogram.

7. The method according to claim 6 , wherein the hue distribution of the original image is a hue histogram normalized by saturation and value.

8. The method according to claim 5 , wherein the hue distribution of the color harmonic scheme is a uniform distribution.

9. The method according to claim 5 , wherein the comparison between the hue distribution of the original image and the hue distribution of the color harmonic scheme is the Kullback-Leibler divergence.

10. A non-transitory program storage device, readable by a computer, tangibly embodying a program of instructions executable by the computer to perform a method comprising:

computing, using a processor, at least a temporary harmonized image determined from the original image according to at least one color harmonic scheme;

computing, using said processor, a saliency map of said temporary harmonized image;

computing, using said processor, a saliency comparison result obtained from a comparison of a saliency map of the original image and the saliency map of said temporary harmonized image;

computing, using said processor, a corrected color comparison result from colors of the original image, colors of the color harmonic scheme and the saliency comparison result;

selecting, as the harmonized image, the temporary harmonized image obtained with the color harmonic scheme minimizing the corrected color comparison result; and

displaying the harmonized image on a display device.

11. A device for harmonizing colors of an original image, the device comprising at least a processor configured to:

compute, using a processor, at least a temporary harmonized image determined from the original image according to at least one color harmonic scheme;

compute, using said processor, a saliency map of said temporary harmonized image;

compute, using said processor, a saliency comparison result obtained from a comparison of a saliency map of the original image and the saliency map of said temporary harmonized image;

compute, using said processor, a corrected color comparison result from colors of the original image, colors of the color harmonic scheme and the saliency comparison result;

select, as the harmonized image, the temporary harmonized image obtained with the color harmonic scheme minimizing the corrected color comparison result; and

displaying the harmonized image on a display device.

12. The device according to claim 11 , wherein the saliency comparison result is a correlation coefficient between the saliency map of the original image and the saliency map of the temporary harmonized image.

13. The device according to claim 12 , wherein the correlation coefficient is a linear correlation coefficient between the saliency map of the original image and the saliency map of the temporary harmonized image.

14. The device according to claim 11 , wherein the corrected color comparison result is computed by dividing a color comparison result with the saliency comparison result, the color comparison result being the result of a comparison between the colors of the original image and the colors of the color harmonic scheme.

15. The device according to claim 14 , wherein the color comparison result is a result of a comparison between a hue distribution of the original image and a hue distribution of the color harmonic scheme.

16. The device according to claim 15 , wherein the hue distribution of the original image is a hue histogram.

17. The device according to claim 16 , wherein the hue distribution of the original image is a hue histogram normalized by saturation and value.

18. The device according to claim 15 , wherein the hue distribution of the color harmonic scheme is a uniform distribution.

19. The device according to claim 15 , wherein the comparison between the hue distribution of the original image and the hue distribution of the color harmonic scheme is the Kullback-Leibler divergence.